665596 has 6 divisors (see below), whose sum is σ = 1164800. Its totient is φ = 332796.

The previous prime is 665591. The next prime is 665603. The reversal of 665596 is 695566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83196 + ... + 83203.

2⁶⁶⁵⁵⁹⁶ is an apocalyptic number.

It is an amenable number.

665596 is a deficient number, since it is larger than the sum of its proper divisors (499204).

665596 is a wasteful number, since it uses less digits than its factorization.

665596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166403 (or 166401 counting only the distinct ones).

The product of its digits is 48600, while the sum is 37.

The square root of 665596 is about 815.8406707195. The cubic root of 665596 is about 87.3112557418.

The spelling of 665596 in words is "six hundred sixty-five thousand, five hundred ninety-six".